Maggots only eat rotting or dead flesh. Now, maybe some flesh eating desert wasp larvae would be more suiting for your needs of torture.
or you could set him on one side of a room, surrounded by sharp, rust, random objects, then about 25 feet away a vat of iodine or alcohol (or pure hydrogen peroxide), and have food after that. If he doesn't eat, he will die. Once he gets to the other side to find that the food is incredibly salty, put a glass of water right where he started. He'll either go insane and roll around on the floor and drown in the nasty chemical vat or starve or die of dehydration.
Not sure if that would work though....
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